Search Publications
ISO observations of the Galactic center interstellar medium. Ionized gas
Rodríguez-Fernández, N. J.; Martín-Pintado, J.
We present fine structure and recombination line observations of the ionized gas toward a sample of 18 sources located within 300 pc of the center of the Galaxy (hereafter Galactic center, GC). The sources were selected as molecular clouds located far from thermal continuum sources. The fine structure lines from [NII] and [SIII] were detected in 1…
Mesoscale flows in large aspect ratio simulations of turbulent compressible convection
Rieutord, M.; Rincon, F.; Lignières, F.
We present the results of a very large aspect ratio (A=42.6) numerical simulation of fully compressible turbulent convection in a polytropic atmosphere, and focus on the properties of large-scale flows. Mesoscale patterns dominate the turbulent energy spectrum. We show that these structures, which had already been observed in Boussinesq simulation…
The XMM-Newton view of three X-ray weak quasars: Iron emission and strong ionized absorption
Clavel, J.; Guainazzi, M.; Schartel, N. +4 more
We present the analysis of XMM-Newton observations of three X-ray weak quasars: PG 1001+054, PG 1535+547 and PG 2112+059. All objects are absorbed by ionized material showing high column densities, NH = 2.9 × 1022~cm-2 to NH = 1.9 × 1023~cm-2, and ionization parameters, ξ = 147 ~erg…
The calm after the storm: XMM-Newton observation of SGR 1806-20 two months after the Giant Flare of 2004 December 27
Tiengo, A.; Mereghetti, S.; Stella, L. +5 more
XMM-Newton observed the soft gamma repeater SGR 1806-20 about two months after its 2004 December 27 giant flare. A comparison with the previous observations taken with the same instrument in 2003-2004 shows that the pulsed fraction and the spin-down rate have significantly decreased and that the spectrum slightly softened. These changes may indica…
Generation of microwave bursts with zebra pattern by nonlinear interaction of Bernstein modes
Kuznetsov, A. A.
The processes of generation and nonlinear interaction of Bernstein modes are investigated. The physical conditions considered correspond here to the sources of microwave bursts with a zebra pattern. It is shown that the simultaneous generation of plasma waves corresponding to several cyclotron harmonics is possible under these conditions. Nonlinea…
Resolving the hard X-ray emission of GX 5-1 with INTEGRAL
Rodriguez, J.; Kuulkers, E.; Paizis, A. +5 more
We present the study of one year of INTEGRAL data on the neutron star low mass X-ray binary GX 5 1. Thanks to the excellent angular resolution and sensitivity of INTEGRAL, we are able to obtain a high quality spectrum of GX 5 1 from ~5 keV to ~100 keV, for the first time without contamination from the nearby black hole candidate GRS 1758-258 above…
XMM-Newton observation of the anomalous X-ray pulsar 4U 0142+61
Wilms, J.; Staubert, R.; Göhler, E.
We present results of an observation of the anomalous X-ray pulsar 4U 0142+61 with the EPIC cameras on XMM-Newton performed on 2003 January 24. The pulse phase averaged spectrum can be best described by the sum of a black body with a temperature of kTBB = 0.395(5) keV and a power law with photon index Γ=3.62(5). The unabsorbed 2-10 keV …
A slow coronal mass ejection with rising X-ray source
Mandrini, C. H.; van Driel-Gesztelyi, L.; Harra, L. K. +2 more
An eruptive event, which occurred on 16th April 2002, is discussed. Using images from the Transition Region and Coronal Explorer (TRACE) at 195 Å, we observe a lifting flux rope which gives rise to a slow coronal mass ejection (CME). There are supporting velocity observations from the Coronal Diagnostic Spectrometer (CDS) on the Solar and Heliosph…
Spectroscopic behaviour of the unusual Ae star HD 190073
Pogodin, M. A.; Franco, G. A. P.; Lopes, D. F.
The results of high-resolution spectroscopy of the peculiar Ae star HD 190073 obtained within the framework of a cooperative observing programme in 1994-2002 are presented. The temporal behaviour of the Hα, Hβ, Hγ, Hδ, He i λ 5876 Å, Na i D and other circumstellar line profiles are investigated in detail. Special attention has been paid to the ana…
XMM-Newton data processing for faint diffuse emission. Proton flares, exposure maps and report on EPIC MOS1 bright CCDs contamination
Kerp, J.; Pradas, J.
We present a study of the in-flight performance of the XMM-Newton EPIC MOS and pn detectors, with focus on the influence of proton flares and vignetting on the data. The very wide range in the conditions of our sample of observations, in terms of exposure length and background intensities, allows the detection of a wide range in the spectra of the…